(adsbygoogle = window.adsbygoogle || []).push({}); If I downgrade (and jailbreak) my 3.50 PS3 with my TI-84 Plus, I know some of the risks include Losing HDD data and losing Blu-Ray playback, but I want to know these specifics too:

1. 1. Can you backup everything? Like patches, Users, Downloaded content, etc. I don't want to lose all of my add-ons. What can't you backup?
   
2. 2. How common is the loss of Blu-Ray Playback? Is there anything specific that might be causing it that I shouldn't do?
   
3. 3.I have an 80gb PS3 and under system settings it says 18/74 Gb available, does this mean I need an at least 56 Gb portable HDD to backup my PS3?